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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7a1add2467514ace959bdb6a1cd0046b17e3c928af10f377ef96ae4a3f28bfe' 
  AND token = 'pceMXF5HBIq23ydz65+SisLyC2oZFJGV5apVoFkNyfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}